Bonne (Cordiform) Equal-area projection.
The BONNE command has these optional parts:
Parameter Description 1 Latitude of standard parallel
2 Latitude of standard parallel
3 Latitude of standard parallel
In all versions of CAM and MicroCAM.The default value of the standard parallel is set to 0°, creating the Sinusoidal form of the projection.
Selects the Bonne equal area projection with the standard parallel of 50° as used by Rigobert Bonne.
Selects the heart-shaped Cordiform (a.k.a. Stab-Werner or Werner) polar case of the Bonne equal area projection.